Valve.



B. A. SPERRY.

VALVE.

APPLIOTION FILED FEB. 21, 1895.

Patented Feb. 27, 1912.

2 SBEETS-SHIJET 2.

ELMER A. Stmv, or CLEVELAND, omo.

Speciflcation of Letters Patent.

Patented Feb. 27, 1912.

Application filed February 21, 1885. Serial No. 539,298.

To all whom t may concern:

Be it known that I, ELMER A. SPERRY, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Valves, of Which the following is a specification.

My invention relates to means for automatically preserving an efl:ective action of valves, such as puppet-valves, and it consists in a construction whereby a grinding of the valve parts on one another when the valve seats is accomplished by a eater or less amount of rotary motion Whl0h is im partd to the valve at suitable periods during its lifting action, preferably either while.

opening or closing, all of which is pointed out in the following specification, reference being had to the accompanying drawings,

in which- Fi re 1 represents a sectional view of one orm of device as applied to the valve; Figs. 2

device,

and 3 represent the same form o wherein the action is rendered intermittent, with reference to the valve openings; Fig. 4 is a modification which represents a device for relieving the friction; Fig. 5 r'epresents fully the details of another form of the structure; Fig. 6 is a detail of the valve-rotating device shown in Fig. 5.

Like letters of reference indicate like parts throughout the several views.

Referring now to Fig. 1, it will be seen that the casing C C contains the usual passages of a puppet-valve, together with the valve opening containing seat a against which rests the valve proper, a. The valve is supported and guided by a valvestem B passing outward through the walls of the casing, as is usual in structures of this character. The valve-stem is provided with a head H which receives the thrust of the spring O by means of which the valve is normally held to its seat. The head H of the valve-stem will also be seen to be provided with ratchet-teeth t, which, in Fig. 5, are on the periphery of the head, whereas in the other figures, they are upon the crown of the head. Wherever these teeth may be located, the; co6perate with the pawl P, seen in the act of engagement in Figs. 2 and 3, which in Fig. 5 passes behind the head H and which serves, by engagement of the teeth, to impart a rotary m0- tion (more or less in extent) to the valve. It will furthermore be nticed that the pawl ing to impart .referring now to f S the hook of the pawl,

P is operated, or has motio'n imparted to it, by a mechanism, which at the same time is associated with, or forms a part of, the valve-opening mechanism, so that the period of its movement bears some relation to the moveme'nt of the valve, the object bea slight rotary movement to the valve, preferably at the time that it is either being lifted from the seat, or just before seating. Bearihg this in mind, and

Fig. 5, it will be seen that the valve-opening mechanism consists in a rocker-shaft R and the 'rockerarm R, which co6perates with the convex surface of the lever L, swinging upon the fulcrum L and which, when depressed, forces the valve, head, stem and all, downwardly and 0l its seat, opening the valve. During this motion, it will be seen that the spring S is compiessed, exerting its pressure against the head of the pawl P indicated at p and seen to the right, within the rectangular recess which is not seen, being behind the head H, is engaged with the teeth t of such head, and as soon as the pressure at the valve-seat has been sufiiciently reduced by the downward pr'essure from the lever L, the pressure of the spring S, which is constantly increasing, is presently found sufiicient to cause a movement of the pawl P and a corresponding slight rotation of the head H, stem B, and valve A. It will be riotioed that at the time of this rotation, the valve is still in contact with its seat a, although its pressure thereon has been materially decreased, but suf'ficient pressure still remains to efl'ectually grind the surfaces or sweep them clear of any abrading substance.

Comparing the above outlined action with that of Figs. 1, 2 and 3, it Will be seen that the corresponding parts are indicated by similar letters; i. e., the pawl P, valve-stem B, teeth t, and valve-opening lever L are all present, but in somewhat altered form. The valve-opening lever L, swinging around its fulcrum, shown in Fi 1, vibrates upward and downward over t e valve-stem B, and is provided immediately above same with an abutting piece H, mounted on the stem H (see Fig. 3), provided with friction relieving balls G. At the upper end, near the letter H will be seen a retaining pin, for preventing the downward movement of the stem with reference to the lever L. On an upward projection of the lever L near p is in any other part of the cam slot, thethis point, (Figs. 1 and 3), is provided a pvot D, upon which is mourited a cam held thereon by nut D" and provided at 1ts peri hery with means of efl'ecting its rotat1on, wiiich, in the present instance, consists of ratchet-teeth, which co6perate with the dog G, mounted upon the Stationary part (see Figs. 1 and 2) held by the pvot G, and forced into engagement with the cam by spring g. The pawl P in these figures ls not mounted directly upon the valve-dpemng lever L, but is connected therewith by a link L, which is depressed forcibly by the spring S. A pin su1tably located upon th1s link within the cam, and indicated at 77 (Fig. 1), engages the slot r of thecam D, by means of which the link as awhole may be raised or lowered according to its position in the cam slot, which is provided with one or more radial enlargements 7" allowing the pin p to descend with the link L whenever one of these is reached in course of the rotation of the cam D, this position being that shown in Figs. 2 and 3. At such times the downward movement is sufiicient to allowthe pawl P to engage theteeth t, as

1ndicated in these figures, but when the pin link L" and pawl P are raised so that the link is entirely out of engagement with the teeth t, during all parts of the excursion of the lever L, as it descends in the act of pushing the valve-stem B downwardly and opening the valve. When however the link L" is in its lower position, the pa'wl P engages one of-the teeth t, as the lever L descends toward the end of the valve-stem and prior to actual engagement between it and the abutment H provided for the purpose, and then during the remainder of the descending motion and before pressure is exerted upon the valve stem B, an upward movement is imparted through the engagement of the pawl with the teeth t to the link L, whereby the spring S is energized, which spring S, acting through the parts, urges the pawl P to rotate the valve-stem B, through the teeth t, as soon as the descending pressure upon the valve-stem Bhas sufliciently relieved the friction at the valve-face, to allow of such rotary movement. Upon each upward m0vementof the valve-Operating lever L, carrying with it the cam-wheel D, the pawl G will engage 'a'new tooth upon the pe1iphery of thecam and cause it in this manner to acquire, step by'step, rotary motion. As this motion proceeds, the depression r is finally turned from pin p, which now finds itself in a small part of the slot and the pawl P is raised clear from engagement with the teeth t. Thus it will be seen that a number of valve-openings will occur before the pawl P is again permitted to engage the teeth t, or any attempt at rotation of the valve ls made. This rotation, in case to clear itself 1nterrupted action, as compared with the valve-openings, whereas in Fig. 5 it willbe seen that it occurs synchronously therewith. The 'grinding efl'ect thus imparted to the valve is. of especial valu to.give a clean, brightseat and impart a constant tendency from any collecting matter. Io is especially serviceable where corrosive substances, gas and liquids, are handled at high temperatuies, to corrode the surfaces and soon render them leaky and ur1suitable -for use.

The operation has been so constantly referred to throughout the description, that which have a tendercy it will,not req11ire further special "mention.

The word lifting is used in this specification and claims in the ordinary sense with which it is employed in connection with puppet valves and refers to the unseating or movement of the valve away from its seat regardless of the position in which the valve may at the moment stand.

Of course it will be readily understood that the valve casing may be of any style or design and with other forms of construction and details of rotary mechanism,- without departing from the spirit of the" invention. Also other means may be employed for interrupting the action, and while it is intended that all the principal features of the invention are to be em ployed and operated in connection with each other, yet some may be used without the others and the invention extends to such use.

What I claim as new and desire to secure by Letters Patent of the United States is,

1. The combination of a lifting valve and stem, a seat for the valve, means for raising the valve from its seat, a ratcheted head attachedto said valve-stem, and a pawl connected to the reciprocating parts operating the valve, whereby when the said valve is unseated a partial rotation is imga(1ted to the same, 'substantially as speci- 2. The combination of a lifting valve and stem, a seat for the valve, means for raising the said valve from its seat, means for partially rotating said valve during the operation of unseating, and means whereby Said partial rotation comes into operation during a portion only of the seatings and unseatings of the valve, substantially as a. The combination of a lifting valve and stem, a seat for the valve, means for raising said valve from its seat, means for partially rotating said valve during the operation of unseating, means whereby said partial rotation comes into operation during a portion only of the seatings and unseatings of the valve, and mechanism whereby the last named means is intermittently operated simultaneously with the seatings and unseatings of the valve, substantially as specified.

4:. The combination of a lifting valve and stem, a seating for the valve, means for raising the valve from its seat, means for partially rotating said valve while still engaging the seat, and an intermittently rotated cam, operated simultaneously with the seat-ings and unseatings of the valve,

and coming periodically into operative communication with the said means for partially rotating the valve, substantially as specified.

5. In combination, a valve seat, a valve held against the seat with considerable pressure when the valve is closed, means for moving the valve away from the seat to open it, and means for rotating the valve relative to the seat after the pressure between the valve and seat is diminished by the initial operation of the valvemoving means, but before the valve has been moved out of enga ement with its seat.

6. In com ination with a lifting and rotating valve, a vibrating lifter for the valve, a spring for rotating the valve, and means whereby the spring is energized by the vibrations of the said lifter.

7. In combination with a lifting and ro tatin valve, a vibratin lifter, means for rotat1ng the valve, incombination with a spring imparting a yielding tension to the said means for rotating the valve, whereby rotation does not take efl'ect until a portion of the pressure upon the valve-seat has been relieved.

8. In combination, a rotating and lifting valve and its seat, means for subjecting the valve to pressure upon its seat, means for partially removing such pressure and means for rotating the valve at the time of such partial removal of pressure and while the valve engages the seat.

9. In combination, a rotating and lifting valve and its seat, means for subjecting the valve to pressure upon its seat, a combined means for partially removing such pressure and for lifting and reseating the valve, and means for rotating the valve at the time of such partial removal of pressure and while the valve en ages the seat.

10. In com ination, a rotating and lifting valve and its seat, means for subjecting the valve to pressure upon its seat, means for partially removing such pressure and a resilient means for rotating the valve at the time of such partial removal of pressure and while the valve engages the seat.

11. In combination, a rotating and lifting valve and itsseat, means for subjecting the valve to pressure upon its seat, means for partially removing such pressure and means for per1odically rotating the valve, the said period made to occur at the time of the said partial removal of pressure and while the valve engages the seat.

12. In combination with a lifting and rotatin valve a vibrating lifter, means for rotat1n the valve in combination with intermed1ate mechanism whereby the rotation takes effect only after a portion of the pressure upon the valve seat has been relieved and while the valve still engages the seat.

ELMER A. SPERRY. Witnesses:

S. BRASHEAR, J r., WILLIAM CALVER. 

